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根据完整性检查的时间不同，可把完整性约束（）（Immediate Constraints）和（）（Deferred Constraints）。
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更多 “根据完整性检查的时间不同，可把完整性约束（）（Immediate Constraints）和（）（Deferred Constraints）。” 相关考题
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The Project Management Triangle is a model of the constraints of project management. These constraints have been listed scope (or quality),(), and cost.A.resourceB.timeC.planD.tool
考题
以下关于关系的完整性约束叙述错误的是______。A) 关系的完整性约束分为静态完整性约束和动态完整性约束B) 动态完整性约束是基于关系模式的，主要由主码约束、外码约束和域约束组成C) 动态完整性约束更多的是基于企业或组织的业务规则的D) 主码必须满足唯一性A．B．C．D．
考题
The Project Management Triangle is a model of the constraints of projectmanagement.These constraints have been listed scope(or quality),（73）,and cost.A.resource
B.time
C.plan
D.tool
考题
数据库三层约束的内容：码约束--实体完整性（entity integrity）约束，参照完整性（referential integrity]约束和用户参照完整性。简述关系模式中的三种完整性。
考题
关系数据库的完整性约束包括（）A、实体完整性、约束完整性和主关键字完整性B、数据库定义完整性、参照完整性和用户定义完整性C、实体完整性、参照完整性和用户定义完整性D、表结构完整性、用户定义完整性和事务完整性
考题
Which two statements are true about constraints? （）A、The UNIQUE constraint does not permit a null value for the column.B、A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.C、The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.D、The NOT NULL constraint ensures that null values are not permitted for the column.
考题
What is true about updates through a view? （）A、You cannot update a view with group functions.B、When you update a view group functions are automatically computed.C、When you update a view only the constraints on the underlying table will be in effect.D、When you update a view the constraints on the views always override the constraints on the underlying tables.
考题
Which three statements correctly describe the functions and use of constraints? （）A、Constraints provide data independence.B、Constraints make complex queries easy.C、Constraints enforce rules at the view level.D、Constraints enforce rules at the table level.E、Constraints prevent the deletion of a table if there are dependencies.F、Constraints prevent the deletion of an index if there are dependencies.
考题
Which two statements about creating constraints are true? （）A、Constraint names must start with SYS_CB、All constraints must be defines at the column levelC、Constraints can be created after the table is createdD、Constraints can be created at the same time the table is createdE、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view
考题
Which two statements about creating constraints are true?（）A、Constraint names must start with SYS_CB、All constraints must be defines at the column level.C、Constraints can be created after the table is created.D、Constraints can be created at the same time the table is created.E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.
考题
多选题Which two statements about creating constraints are true?（）AConstraint names must start with SYS_CBAll constraints must be defines at the column levelCConstraints can be created after the table is createdDConstraints can be created at the same time the table is createdEInformation about constraints is found in the VIEW_CONSTRAINTS dictionary view
考题
多选题Which two statements about creating constraints are true?（）AConstraint names must start with SYS_CBAll constraints must be defines at the column level.CConstraints can be created after the table is created.DConstraints can be created at the same time the table is created.EInformation about constraints is found in the VIEW_CONSTRAINTS dictionary view.
考题
单选题关系数据库的完整性约束包括（）A
实体完整性、约束完整性和主关键字完整性B
数据库定义完整性、参照完整性和用户定义完整性C
实体完整性、参照完整性和用户定义完整性D
表结构完整性、用户定义完整性和事务完整性
考题
问答题约束理论（Theory of Constraints，简称TOC）的基本思想表现在哪些方面？
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